Steam-boiler



M. MAHONY.

STEAM BOILER.

(No Model.)

No. 365,141. Patented June 21,1887.

W J m N, PETENs. Plvolo-Llmogmpher. WilsllmgimL UNITED STATES MICHAELMAHON Y, OF TROY, FE? YORK.

STEAM- BOILER.

SPECIPICATION' forming part of Letters Patent No, 365,141, dated June21, 1887.

Application filed May 13,1735). Serial No. 23?,108. (X0 model.)

To all whom it may concern.-

Be it known that I, BUQHAEL BIAHONY, a citizen of the United States,residing at Troy, in the county of Hcnsselaer, State of New York, haveinvented certain new and useful Improvements in Steam-Boilers, of whichthe following is a specification, reference being had therein to theaccompanying drawings.

This invention has relation to steamgenera tors, more particularly ofthat class of watercirculators that are made of cast metal for heatingdwellings and other buildings; and the object of my invention is toprovide a waterheater for such purposes as will be automatic inoperation, and thus dispense with the attendance of an engineer, and inwhich the water will circulate rapidly and the steam will be superheatedby the escaping products of combustion; and to that end the inventionconsists in the construction of the same, as will be hereinafter morefully described, and more particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of a boilerconstructed in accordance with my invention. Fig. 2 is a transversevertical section of the same. Fig. 3 is a horizontal section through theupper end of the magazine, the snperheatirig-pipes, and the hood againstthem. Fig. 4 is a horizontal section showing a bottom view of the crownsheet of the boiler.

In said drawings, A is the outer shell, and B the inner shell, of theboiler. These parts are supported by the base-plate O, forming the topof the ash-pit D, the walls of which support the grate D. Projectingfrom the surface of the base-plate there is a vertical flange, 0, thatsurrounds the lower end of the shell of the boiler and maintains it inproper position. The two shells of the boiler are retained a few inchesapart, to form a water leg or chamber surrounding the inner shell. Thelatter has cast therewith a central vertical flue, B", that extendssubstantially up to thetop of the outer shell of the boiler, and isfitted and cemented thereto at that point, substantially'as hereinafterdescribed, in relation to the joint formed at the lower end of theshells. Thisis accomplished at said lower end by forming an annu larrib, a, on the inside of the outer shell and an annular rib, b, on theoutside of the inner shell. The latter rib is turned so as to sub-vstantially fit within the rib a, and has a circular groove, if, out init to receive a suitable cement well packed therein to form a watertightjoint at that point. The side walls of the inner shell are corrugated toincrease its heating-surface and elasticity. Its crow n-sheet 3 isprovided with radial ribs I), that are pendent therefrom, to evenlydistribute the heated products of combustion against said crown-sheetand all around the interior of the 'flue D.

To increase the water-heating capacity of the boiler and form acoal-retaining magazine therein, a coil, E, is suspended in thefire-chamher at some distance above the burning coal, and with itsperiphery at some distance also from the inner shell to maintain a broadannular passage between it and said shell. The upper portion of thiscoil passes through the crownsheet, and is secured by a nut, e, placedupon said portion, and the upper end of the pipe is bent nearlyhorizontally to deflect the water rushing from said end when inoperation. The lower end of the pipe E passes through the side of theinner shell, B, and is retained by a nut, 0. Access to this fasteningcan be ob tained through an opening made in the outer shell oppositesaid lower end of the pipe; but otherwise said opening is closed by ascrcwtap, a". The steam produced in the coil and boiler, is superheatedand carried off by means of two pipes, f, issuing vertically from thetop of the boiler. They are united at their upper end by means of ahorizontal pipe, f, carrying in the middle of its length a verticalpipe, f". The combined area of the two pipes 1" being more than the areaof the pipe f, priming of the boiler is thereby greatly prevented.

The pipes f and f may be covered by a hood, G, through which theproducts of combustion escape to the due g, and thus their temperaturebe maintained at a high degree; but they are shown against it tofacilitate the removal ofthc magazine. This hood also incloses the upperend of the tubular magazine H, that extends down to the first or uppercoil of the pipe E. The upper end of the magazine H has a lateralextension, H, through which coal can be poured into the magazine, andthe front end of said extension, together IOC with the front of thehood, is closed by a door G, hinged to the side of said hood.

The boiler is provided with a steam-gage, I, a safety-valve, J, and adraft-regulating diaphragm and lever, K, of suitable construction.

Having now fully described my invention, I clain1 1. The combination ofthe outer shell of a boiler, steam-pipes issuing from the top thereof,and a hood against said pipes, and having a door upon one of its sides,with an inner shell having a central smoke-flue, and within said fiueacoal-magazine having its upper end closed by the door of the hood,substantially as and for the purpose described.

2. The combination of the outer shellof a boiler, steam-pipes issuingfrom the top thereof, and a hood adjacent to said pipes, with the innershell having a central smokeflue, and. within said flue a.coal-magazinehaving its upper end under said hood, and a waterholding with pendentradial ribs, a central smoke-flue,

a magazine therein, arranged as shown, and a water-holding coil undersaid magazine, and forming the lower end thereof, substantially asdescribed.

In testimony whereof Iaffix my signature in presence of two witnesses.

MICHAEL MAHONY.

\Vitnesses:

E. E. MASSON, E. C. WURDEMAN.

